M&S says

Keep your tie firmly in place throughout the day with a classic tie clip. This metal tie bar sits neatly against the shirt, pinning your tie down to avoid unwanted shifts as you go about your daily business. Horizontal stripes lend a sophisticated texture to this essential accessory.

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35 days to return - You may return or exchange unused products within 35 days of purchase with a valid parcel summary document. Your items don't need to be in the original box or bag as long as they're securely packaged.How to return
1. FREE returns to select M&S stores
2. Easy returns from home. Simply print the returns label, attach it to the top of your parcel and insert the returns note in the parcel. We will automatically deduct the cost of return from your refund.
To print the returns label and return, simply click here.Tell me more about how to return items and the returns policy